KR20120118274A - Scratch self-healing polypropylene composition and mouldings produced therefrom - Google Patents

Abstract

PURPOSE: A polypropylene-based resin composition is provided to maintain excellent mechanical properties, impact resistance, and durability without emitting volatile materials, to be suitable for interior components of a vehicle, and to have excellent scratch self-healing performance. CONSTITUTION: A polypropylene-based resin composition comprises 100.0 parts by weight of polypropylene-based resin, 2-30 parts by weight of microcapsules of which average particle diameter is 0.01-100 micron, using cyclic olefin as an internal material and of which wall material is a melamine-formaline resin or urea-formaline resin, 0.001-0.5 parts by weight of a transition metal-carbene complex catalyst, and 0.01-10 parts by weight of polyolefin-based compatibilizing agent. The polypropylene-based resin is a propylene homopolymer or a copolymer comprising propylene.

Description

Scratch Self-healing Polypropylene Composition and Moldings Produced therefrom

The present invention relates to a novel polypropylene resin composition and a scratch self- regulating molded article prepared therefrom.

More particularly, the present invention relates to a new polypropylene resin composition suitable for automobile interior parts having excellent scratch self-renewal and a molded article produced therefrom.

Polypropylene resins, which are most widely applied to automobile interior parts such as crash pads, doatrims, interior trims, etc., have been spotlighted due to many advantages, such as good mechanical properties, light weight materials, and recyclability, but they are important factors for visual sensitivity. There is a serious problem that the surface damage is easily caused by the scratch, so countermeasures are urgent.

Although the surface damage caused by scratches, the so-called "scratch self-regenerating" paint has recently been introduced into the automotive exterior material, which has a self-healing recovery ability over time and returns to its original state where scratches are hardly seen. There is an urgent need to develop a new concept of highly sensitive polymer materials and components having excellent mechanical properties, impact resistance, heat resistance, and the like, as well as excellent mechanical properties, impact resistance, heat resistance, and the like, for automotive interior materials and components made of a resin composition.

Until now, the method of coating a molded article has been most widely used as a means of solving scratches on molded articles made of polypropylene composites. However, as the coating process is added, the manufacturing process is complicated and the unit cost is increased. In addition, the volatile substance is released due to the organic solvent used during the painting process. The situation is exposed to regulation. As a solution to this problem, a method of adding a silicone resin such as polydimethylsiloxane having a high molecular weight as a lubricant to a polypropylene resin composition as a raw material for a conventional unpainted automobile interior part has been newly proposed (Elastomer, 43 (3), 183 (2008)). The addition of such lubricants smoothes the surface of the product and reduces the coefficient of friction, thereby distributing the impact from the outside to the surface. However, the scratch resistance is somewhat improved compared to the coating, and the surface gloss is also improved. Since there is a disadvantage in that the sensitivity of the molded article to increase the quality of the scratches, there is an urgent need for the emergence of a new material manufacturing technology that can significantly improve scratch resistance, such as scratch self-renewal.

In order to solve the above problems, the inventor of the present invention has made intensive studies and has come to the present invention. In other words, the present invention is suitable for environmentally-friendly, unpainted automotive interior parts that have good mechanical properties, impact resistance and heat resistance, and have no concern about volatile emission, and are a novel polysensitivity polymer with a new concept of highly sensitive polymer having scratch self-renewability. It is to provide a propylene resin composition and a molded article prepared therefrom.

The polypropylene resin composition of the present invention for achieving the above object has an average particle diameter of 0.01 to 100 μm with a cyclic olefin as an inner material and a wall material of melamine-formalin resin or urea-formalin resin with respect to 100 parts by weight of polypropylene-based resin. 2 to 30 parts by weight of the fine capsule, 0.001 to 0.5 parts by weight of the transition metal-carbene complex catalyst, and 0.01 to 10 parts by weight of the polyolefin compatibilizer.

In addition, the present invention may further comprise 5 to 100 parts by weight of the thermoplastic elastomer, based on 100 parts by weight of the polypropylene resin.

In addition, the present invention may further comprise 5 to 100 parts by weight of inorganic particles, based on 100 parts by weight of the polypropylene resin.

In addition, the present invention provides a scratch self-regenerated molded article characterized in that the polypropylene resin composition is obtained by melting and extruding or injection processing.

In another aspect, the present invention provides a scratch self-reproducing automotive parts, characterized in that the polypropylene resin composition is obtained by melting and extrusion or injection processing.

Hereinafter, the present invention will be described in detail. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

In the present invention, a new polypropylene-based resin composition, which is suitable for environmentally friendly unpainted automotive interior parts and has a new concept of highly sensitive polymer material having scratch self-renewability, and the technology introduced to obtain a scratch self-renewable molded product manufactured therefrom There are five key points.

First, the microcapsules in which the liquid scratch self-reproducing compound is filled with a core material and the polymerization catalyst of the scratch self-reproducing compound are contained in the polypropylene resin composition.

Second, the melamine-formalin resin or urea-formalin resin, which is a thermosetting resin that is easy to encapsulate and has excellent heat resistance, is used as a shell of the microcapsules. The microcapsules are designed so that they remain unbreakable and well dispersed even in the kneading dispersion process.

Third, in consideration of the fact that the wall material of the microcapsule has a hydrophilic surface characteristic, it is very difficult to disperse it in a lipophilic polypropylene resin, to maximize the dispersion of the microcapsule by introducing a polyolefin resin containing a hydrophilic functional group as a compatibilizer. It is.

Fourth, when a scratch occurs in the automotive interior parts molded from the polypropylene resin composition containing the microcapsules and the polymerization reaction catalyst, the microcapsules are easily broken, and the liquid scratch self-renewing compound flows out to the indentation region where the scratches occur. At the same time, a new concept of scratch self-renewal is introduced by reacting rapidly with a polymerization catalyst existing at the same time and converting it into a solid polymer.

Fifth, the transition metal-carbene complex system that adopts a cyclic olefin as a scratch self-renewal compound and can cause a ring opening metathesis polymerization at room temperature quickly to achieve a new concept that the scratch self-renewal is exhibited The catalyst is adopted. In particular, the cyclic olefin polymer to be filled in the scratch-generating depression region by the ring-opening metathesis polymerization is considered to have a good scratch self-reproducibility to exist in the long term without falling off with excellent compatibility with the polypropylene resin of the matrix resin.

In more detail, the present inventors show that although the heat resistance is poor in the conventional polypropylene resin composition composed of polypropylene resin, thermoplastic elastomer, and inorganic particles, when the thermoplastic elastomer component is increased, the scratch self-renewal is exhibited by the elastic recovery force. It was found, but it was far short of the breakthrough scratch self-renewal that consumers want. In other words, the degree of surface damage caused by small area scratches is increased somewhat by the increase of the thermoplastic elastomer component, but it is found that the effect of self-regeneration on large area scratches is not at all.

Therefore, a novel novel method is required for the expression of self-renewal for a large area of scratch. That is, a large amount of scratch self-reproducing material that is capable of urgently filling and healing a large area of scratch-generating depressions should be uniformly dispersed and pre-existed in the polypropylene-based resin composition. It should be a liquid that can be transformed into a solid phase in a fast time at room temperature, and can be stably present. Furthermore, the scratch self-renewing material converted into a solid phase has excellent compatibility with polypropylene resin, which is possible matrix resin, and is continuously removed without dropping. It was considered deeply that it should be able to exist stably.

As a result, cyclic olefins usually exist in the liquid phase and easily react at room temperature with a transition metal-carbene complex catalyst to form cyclic olefin polymers by ring-opening metathesis polymerization [Grubbs, et al, Organic Letters 1 (6), 953 (1999), Mutch, et al, J. Molecular Catalysis, A133, 191 (1998), Grubbs, et al, Science 243, 907 (1989), Herisson, et al, Die Makromolekulare Chemie 141 (1), 161 ( 1971), this polymer was selected as a resin composition in consideration of its excellent compatibility with polypropylene resin, which is one of polyolefins.

In addition, the liquid cyclic olefin is lipophilic so that it can be finely emulsified in water and can be encapsulated finely by a known in situ method. The cyclic olefin is protected by a capsule wall material and uniformly dispersed in a polypropylene resin composition. It has been found that the large area scratch occurrence depression can be urgently filled and healed.

However, as the kneading dispersion of the microcapsules was made under high temperature and severe friction conditions of the kneading machine such as a twin screw extruder, a large amount of capsules were broken. Accordingly, it was found that the problem of breaking the capsule was completely solved by adopting a wall material of the capsule as a thermosetting resin that is easy to encapsulate and has excellent heat resistance, such as melamine-formalin resin or urea-formalin resin.

However, since the wall material of the microcapsules is made of hydrophilic melamine-formalin resin or urea-formalin resin, it is hardly dispersed in the lipophilic polypropylene-based resin, so that agglomeration occurs so that mechanical properties, impact resistance and heat resistance Not only was it weak, but it was not possible to secure the desired self-renewal. By introducing a polyolefin resin containing a hydrophilic functional group as a compatibilizer, uniform dispersion of the microcapsules is achieved, which ultimately maintains good mechanical properties, impact resistance, and heat resistance, and at the same time, environmentally friendly non-painting automotive interior without fear of volatile emission. The present invention was completed by discovering that a polypropylene-based resin composition, which is a new concept of a highly sensitive polymer new material and part, suitable for a part and has scratch self-renewability and a new scratch self-regenerated molded article prepared therefrom is secured.

In the present invention, the polypropylene resin is a copolymer including propylene in the form of a propylene homopolymer, a block copolymer or a random copolymer, and from the viewpoint of excellent impact resistance, a block copolymer is more preferable, and a melt index 2 to 100 g / 10 min is appropriate.

In the present invention, the cyclic olefin which is an internal material of the capsule and adopted as a scratch self-renewal material is an olefin compound having a cyclic structure, and specifically, for example, norbornene, 5-vinyl-2-norbornene, 5 -Butyl-2-norbornene, 5-methyl-2-norbornene, 5-hexyl-2-norbornene, 5-dimethylmethoxy norbornene, dicyclopentadiene, cyclopentadiene and pendant functional groups ( As a pendant functional group), various norbornene derivatives having polar groups such as oxygen, chlorine, nitrogen, bromine, and fluorine are used. Among these, dicyclopentadiene, cyclopentadiene, norbornene, etc. desirable.

In the present invention, as the wall material of the capsule, a thermosetting resin such as melamine-formalin resin or urea-formalin resin is preferable, which considers excellent heat resistance and ease of encapsulation.

In the present invention, the capsule may be prepared using a known in-situ method and described in detail as follows.

First, an emulsifier aqueous solution is prepared. Emulsifiers are very useful for improving the viscosity and particle size distribution of capsules. As the emulsifier in the present invention, an acrylic acid copolymer, a maleic anhydride copolymer, a styrene sulfonic acid copolymer, or the like may be used. More specifically, the acrylic acid copolymer may be an acrylic acid-methacrylic acid copolymer or an acrylic acid-methacrylic acid-. Alkyl acrylate copolymers, acrylic acid-maleic anhydride copolymers, acrylic acid-itaconic acid copolymers, acrylic acid-alkyl acrylate copolymers, acrylic acid-acrylamide copolymers, acrylic acid-styrene copolymers, and the like. Examples of the copolymer include ethylene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, alpha olefin-maleic anhydride copolymer, alkyl vinyl ether-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, and styrene-maleic anhydride copolymer. And styrene sulfonic acid copolymers. Crylic acid-styrene sulfonic acid copolymer, alkylacrylate-styrene sulfonic acid copolymer, vinyl acetate-styrene sulfonic acid copolymer, maleic anhydride-styrene sulfonic acid copolymer, acrylic acid-styrene sulfonic acid copolymer, styrene-styrene sulfonic acid copolymer, etc. are mentioned. have. The emulsifier aqueous solution may be obtained by adding an emulsifier, water, and usually distilled water to an emulsifier (Homomixer) and stirring at a temperature of 20 ℃ ~ 40 ℃, it is usually prepared in a concentration of 2 to 15% by weight. If the amount of the emulsifier is less than 2% by weight, the emulsification is unstable and difficult to make an emulsification of the desired particle size, and if the amount exceeds 15% by weight, the viscosity of the capsule slurry to be produced with economical problems may be difficult to use.

In the second step, an appropriate amount of the cyclic olefin which will be the inner material of the capsule is added to the aqueous solution of the emulsifier prepared in the emulsifier, and then, the temperature is 20 ° C. to 40 ° C. for 20 to 60 minutes at a speed of 4,000 to 10,000 rpm. Stirring at high speed produces an emulsion mixture of fine size.

In the third step, water is added to a separate reactor, and melamine and formalin or urea and formalin are added and reacted for 20 to 60 minutes at a temperature of 50 ° C. to 70 ° C. to prepare melamine-formalin or urea-formalin prepolymer.

As a fourth step, the melamine-formalin or urea-formalin prepolymer is added to the emulsion mixture contained in the emulsifier and stirred for 1 hour to 2 hours at a speed of 200 to 1,000 rpm at an emulsifier rotation speed between a temperature of 50 ° C. and 70 ° C. While proceeding further the polymerization reaction while obtaining a fine capsule slurry.

As a fifth step, the obtained microcapsule slurry is dried through a dryer such as a spray dryer to obtain a microcapsule.

In the present invention, the fine capsule content is preferably used 2 to 30 parts by weight based on 100 parts by weight of polypropylene-based resin. If it is less than 2 parts by weight, it is difficult to expect the desired scratch self-renewal effect, and if it exceeds 30 parts by weight, mechanical properties, impact resistance and heat resistance may be deteriorated.

In the present invention, the polyolefin-based compatibilizer is maleic acid graft polypropylene, maleic anhydride graft polypropylene, maleic acid graft polyethylene, maleic anhydride graft polyethylene, ethylene-vinylacetate copolymer, ethylene-acrylic acid copolymer, ethylene-meta Krylic acid copolymer, polyethylene ionomer, ethylene-glycidyl acrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-methacrylate-glycidyl acrylate copolymer, ethylene-methacrylate-glycidyl methacryl Late copolymers, etc., and one or a mixture of two or more selected therefrom may be used.

In the present invention, the content of the polyolefin compatibilizer is preferably 0.01 to 10 parts by weight based on 100 parts by weight of the polypropylene resin. If it is less than 0.01 parts by weight it is difficult to expect the effect of improving the dispersibility of the desired microcapsules, if it exceeds 10 parts by weight there is a fear that mechanical properties and heat resistance is poor.

In the present invention, the transition metal-carbene complex catalyst is a transition metal complex such as W, Mo, Ru, etc. using a carbene ligand, and is known from Fischer, et al, "On the Existence of a Tungsten Carbonyl Carbene Complex". Angewandte Chemie, 3 (8): 580 (1964), Arduengo, et al, "A stable crystalline carbene". J. Am. Chem. Soc. 113 (1), 361 (1991), Robert H. Crabtree, " The Organometallic Chemistry of the Transition Metals (4th ed.) ", New Jersey, Wiley-Interscience (2005), Aldeco-Perez, et al," Isolation of a C5-Deprotonated Imidazolium, a Crystalline "Abnormal" N-Heterocyclic Carbene " Science 326, 556 (2009)), such as benzylidene-bis (tricyclo), a first-generation Grubbs' catalyst sold by Sigma-Aldrich, for example. Hexylphosphine) dichlororuthenium (benzlidene-bis) trichlorohexylphosphine (dichloro ruthenium) Benzylidene [1,3-bis (2,4,6-trimethylphenyl) -2-imidazolidinylidene] dichloro (tricyclohexylphosphine) ruthenium (benzylidene [1,3-bis (2,4, 6-trimethylphenyl) -2-imidazolidinylidene] dichloro (tricyclohexyl phosphine) ruthenium).

In the present invention, the thermoplastic elastomer is an ethylene-αolefin-based elastomer such as ethylene-hexene-based elastomer, ethylene-octene-based elastomer, etc., a propylene-α-olefin-based elastomer such as propylene-hexene-based elastomer, propylene-octene-based elastomer, ethylene Thermoplastic olefin elastomers including propylene-diene elastomers, etc., styrene-butadiene block copolymers, styrene-isoprene block copolymers, hydrogenated styrene-butadiene elastomers, styrene-butadiene-styrene elastomers, styrene-ethylene-butyl And thermoplastic styrene elastomers including styrene-styrene elastomers, styrene-ethylene-propylene-styrene elastomers, and the like, and these may be used alone or as a mixture thereof. As a more specific example of such a thermoplastic elastomer, Dow Chemical Engage 8200, an ethylene-octene elastomer, JSR, Dynaron 2324P, a hydrogenated styrene-butadiene elastomer, Kraton polymers, Kraton G1643M, a styrene-ethylene-butylene-styrene elastomer, Etc. can be mentioned.

In the present invention, the thermoplastic elastomer content is preferably 5 to 100 parts by weight based on 100 parts by weight of polypropylene resin. If it is less than 5 parts by weight it is difficult to expect the desired impact resistance improvement effect, if it exceeds 100 parts by weight there is a fear that the heat resistance is poor.

In order to improve the heat resistance of the polypropylene composition according to the present invention may further comprise an inorganic particle. In the present invention, the inorganic particles include talc, calcium carbonate, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, titanium oxide, alumina, mica, asbestos, zeolite, and silicate. And the like may be used, and these may be used alone or as a mixture thereof. The inorganic particles may be in the form of spherical, acicular, or plate-like, and have an average particle diameter of 1 to 10,000 nm, preferably 1 to 1,000 nm, and more preferably 1 to 500 nm. Also preferred are fibrous inorganic particles such as glass fibers and whiskers.

 In the present invention, the inorganic particle content is preferably used 5 to 100 parts by weight based on 100 parts by weight of polypropylene resin. If it is less than 5 parts by weight it is difficult to expect the effect of improving the desired heat resistance, if it exceeds 100 parts by weight there is a fear that the impact resistance is poor.

The polypropylene resin composition according to the present invention is a polypropylene resin, a microcapsule composed of a cyclic olefin as an inner material and a wall material of melamine-formalin resin or urea-formalin resin, a transition metal-carbene complex catalyst, and a polyolefin-based commercialization. The mixture obtained by mixing the agent in an appropriate ratio may be kneaded and dispersed in a pellet form by a kneading machine such as a single screw extruder, a twin screw extruder, a mixing roll, a bambar mixer or a kneader, and the cyclic olefin may be used as an internal substance. The wall material is a mixture of fine capsules made of melamine-formalin resin or urea-formalin resin, a transition metal-carbene complex catalyst and a polyolefin compatibilizer alone, mixed in a mixer, and the resulting mixture is kneaded and dispersed in a kneader to prepare a masterbatch pellet. After obtaining the master batch pellets and polypropylene resin pellets It can be obtained by melt-mixing.

In the polypropylene resin composition according to the present invention, conventional additives such as antioxidants, ultraviolet stabilizers, processing aids, thermal stabilizers, lubricants, pigments, dyes and the like can be blended in a range not impairing the object of the present invention. .

The molded article produced by extrusion or injection by a known method using the polypropylene resin composition according to the present invention, more specifically, a car parts such as crash pads, doatrim, interior trim are also included in the scope of the present invention.

As described above, the polypropylene resin composition according to the present invention and the molded article manufactured therefrom are expected to be very useful for automobile interior parts having excellent mechanical properties, impact resistance, and heat resistance while having excellent scratch self-renewability. do.

The present invention will be described in more detail with reference to the following examples, which are not limited to only one example of the present invention.

Flexural modulus, impact strength, thermal strain temperature, and scratch self-renewal of the specimens prepared according to the following Examples and Comparative Examples were measured as follows.

1. Flexural modulus

After preparing the injection specimen, the impact strength at 23 ° C. was measured according to ASTM D-790 as a measure of the flexural modulus.

2. Impact strength

After preparing the injection specimen, the impact strength at 23 ° C. was measured according to ASTM D-256 as a measure for impact resistance.

3. Heat Deflection Temperature

After the injection specimen was prepared, the heat deflection temperature was measured according to ASTM D-648 as a measure of heat resistance.

4. Scratch self regeneration

Scratch self-regeneration was performed after the injection specimens were prepared, and each specimen was mounted in a scratch tester (manufactured by HEIDON) with a 3Φ sapphire tip, and 10 scratches (20 mm long) were formed under a 500g load. After a period of time, the scratch condition was photographed and scratch self-regeneration was evaluated as the average percentage reduction of the scratch width at the longitudinal midpoint for 10 scratches. Evaluation was made by the following criteria.

[Table 1] Evaluation criteria for scratch self-renewal

Example 1

A styrene-maleic anhydride copolymer (Polyscope Polymers, XIRAN SZ 08250) and distilled water were added to a homer mixer maintained at 35 ° C. to prepare 200 ml of a 5 wt% aqueous solution of an emulsifier. 100 g of dicyclopentadiene (Hangzhou Yangli Petrochemical), one of the cyclic olefins, was added thereto, followed by high speed stirring at a speed of 7,000 rpm for 30 minutes to prepare an emulsion mixture. Then, 100 ml of water was added to a separate reactor maintained at 60 ° C., 35 g of melamine monomer and 35 g of formalin were added thereto, and then reacted at a temperature of 60 ° C. for 40 minutes to prepare a melamine-formalin prepolymer. The melamine-formalin prepolymer was added to the emulsion mixture contained in the homer mixer, and the polymerization reaction was further progressed while stirring at 60 ° C. at a speed of 300 rpm for an emulsifier rotation rate to obtain a microcapsule slurry. The obtained microcapsule slurry was dried through a spray dryer to obtain a microcapsule (capsule A) having an average particle size of 3.5 µm in which the internal substance was dicyclopentadiene and the wall material was melamine-formalin resin.

As a polypropylene resin, a propylene block copolymer (Korea Chemical Industries, Grade CB5230, PP (A)) having a melting index (230 ° C., 2.16 Kg) of 30.0 g / 10 minutes and a melting point of 168 ° C. was prepared. Benzylidene-bis (tricyclohexylphosphine) dichloroleuthenium (Sigma-Aldrich, Catalyst (A)) was prepared as the ben complex catalyst, and the melt index (230 ° C., 2.16 Kg) 49 g / was used as a polyolefin compatibilizer. 10 minutes, maleic anhydride graft polypropylene (DuPont, Fusabond P613, MAH-g-PP) of 162 degreeC was prepared.

A composition (see Table 1) containing a mixture of 5 parts by weight of capsule (A), 0.01 parts by weight of catalyst (A) and 0.3 parts by weight of MAH-g-PP with respect to 100 parts by weight of PP (A) was prepared with a diameter of 70 mm and L / D 40 Into a twin screw extruder and melt-extruded at a cylinder temperature of 200 ℃ to obtain a final polypropylene resin composition (1). The obtained polypropylene resin composition (1) was prepared in an injection molding machine, and the flexural modulus, impact strength, thermal strain temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

[Example 2]

The same as in Example 1, except that 10 parts by weight of the capsule (A), 0.04 parts by weight of the catalyst (A), and 1.2 parts by weight of MAH-g-PP were mixed with respect to 100 parts by weight of PP (A). The polypropylene resin composition (2) was obtained. The obtained polypropylene resin composition (2) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deformation temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

[Example 3]

The same as in Example 1, except that 15 parts by weight of the capsule (A), 0.07 parts by weight of the catalyst (A) and 2.5 parts by weight of MAH-g-PP were mixed with respect to 100 parts by weight of PP (A). The polypropylene resin composition (3) was obtained. The obtained polypropylene resin composition (3) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deformation temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

Example 4

As a thermoplastic elastomer, an ethylene-octene-based elastomer (Dow Chemical, Engage 8200, TPE (A)) of 5.0 g / 10 minutes of a melt index (190 ° C., 2.16 Kg) was prepared.

The composition obtained by mixing 20 parts by weight of the capsule (A), 0.13 parts by weight of the catalyst (A), 4.5 parts by weight of MAH-g-PP and 15 parts by weight of TPE (A) with respect to 100 parts by weight of PP (A) was 70 mm in diameter, L / It put into the twin screw extruder of D40, and melt-extruded at the cylinder temperature of 200 degreeC, and obtained the capsule masterbatch (A). 100 parts by weight of PP (A) and 39.63 parts by weight of the capsule masterbatch (A) were mixed and introduced into a twin screw extruder having a diameter of 70 mm and L / D 40, followed by melt extrusion at a cylinder temperature of 200 ° C. (4) Got. The obtained polypropylene resin composition (4) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deflection temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

[Example 5]

As inorganic particles (E), talc having an average particle diameter of 1.2 mu m was prepared. 25 parts by weight of capsule (A), 0.25 parts by weight of catalyst (A), 7 parts by weight of MAH-g-PP, 25 parts by weight of TPE (A) and 15 parts by weight of Talc based on 100 parts by weight of PP (A) Was injected into a twin screw extruder having a diameter of 70 mm and L / D 40 and melt-extruded at a cylinder temperature of 200 ° C. to obtain a capsule masterbatch (B). 72.25 parts by weight of the capsule masterbatch (B) was mixed with 100 parts by weight of PP (A), and fed into a twin screw extruder having a diameter of 70 mm and L / D 40, followed by melt extrusion at a cylinder temperature of 200 ° C. (5 ) The obtained polypropylene resin composition (5) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deflection temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

[Example 6]

Ethylene-maleic anhydride copolymer (Monsanto, Inc., EMA-31) and distilled water were added to a homer mixer maintained at 30 ° C. to prepare 200 ml of an aqueous 2.5 wt% emulsifier solution. 100 g of norbornene (Topas), one of the cyclic olefins, was added thereto, followed by high speed stirring at a speed of 9,000 rpm for 40 minutes to prepare an emulsified mixture having a fine size. Subsequently, 10 g of urea, 0.1 g of ammonium chloride, 0.1 g of resorcinol, and 35 g of formalin were added to a separate reactor maintained at 55 ° C. and reacted at a temperature of 55 ° C. for 30 minutes to give a urea-formalin prepolymer. Prepared. The urea-formalin prepolymer was added to the emulsion mixture contained in the homer mixer, and the polymerization reaction was further progressed while stirring at 55 ° C. for 1 hour at a speed of 400 rpm of an emulsifier to obtain a fine capsule slurry. The obtained microcapsule slurry was dried through a spray dryer to obtain a microcapsule (capsule B) having an average particle diameter of 2.0 μm, in which the internal material was norbornene and the wall material was a urea-formalin resin.

Benzylidene [1,3-bis (2,4,6-trimethylphenyl) -2-imidazolidinylidene] dichloro (tricyclohexylphosphine) ruthenium (Sigma-) as a transition metal-carbene complex catalyst Aldrich, a catalyst (B)), was prepared as a polyolefin compatibilizer with a melt index (230 ° C., 2.16 Kg) of 13.5 g / 10 min and a melting point of 97 ° C. (metholic acid-ethylene copolymer (DuPont, Nucrel 1214, EMA), and a styrene-ethylene-butylene-styrene-based elastomer (Kraton polymers, Kraton G1643M, TPE (B)) of 18.0 g / 10 minutes was prepared as a thermoplastic elastomer. .

Based on 100 parts by weight of PP (A), 17 parts by weight of the capsule (B), 0.2 parts by weight of catalyst (B), 1.8 parts by weight of EMA and 15 parts by weight of TPE (B) were mixed so that the composition was 70 mm in diameter and L / D 40 Was added to a twin screw extruder and melt-extruded at a cylinder temperature of 200 ° C. to obtain a capsule masterbatch (C). 34 parts by weight of the capsule masterbatch (C) was mixed with 100 parts by weight of PP (A), and introduced into a twin screw extruder having a diameter of 70 mm and L / D 40, followed by melt extrusion at a cylinder temperature of 200 ° C. (6 ) The obtained polypropylene resin composition (6) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deflection temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

[Example 7]

As the inorganic particles (E), glass fibers (GF) having an average diameter of 13.5 μm and a length of 0.6 mm were prepared. Based on 100 parts by weight of PP (A), 28 parts by weight of the capsule (B), 0.4 parts by weight of catalyst (A), 2.4 parts by weight of EMA, and 20 parts by weight of TPE (B) were mixed so that the composition was 70 mm in diameter and L / D. Into a twin screw extruder of 40 and melt-extruded at a cylinder temperature of 200 ℃ to obtain a capsule master batch (D). 50.8 parts by weight of the capsule masterbatch (D) and 18 parts by weight of GF were mixed with respect to 100 parts by weight of PP (A), and fed into a twin screw extruder having a diameter of 70 mm and L / D 40, followed by melt extrusion at a cylinder temperature of 200 ° C. A system resin composition (7) was obtained. The obtained polypropylene resin composition (7) was prepared in an injection molding machine, and the flexural modulus, impact strength, thermal deformation temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

Comparative Example 1

Only PP (A) was produced in the injection molding machine, and the flexural modulus, impact strength, heat deflection temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

Comparative Example 2

Polypropylene resin composition (C2) was carried out in the same manner as in Example 1, except that 100 parts by weight of PP (A) and 16 parts by weight of TPE (A) and 18 parts by weight of Talc were used. Got. The obtained polypropylene resin composition (C2) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deflection temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

[Comparative Example 3]

With respect to 100 parts by weight of PP (A), except that a composition (see Table 1) was used in which 50 parts by weight of the capsule (A), 0.6 parts by weight of the catalyst (A) and 12 parts by weight of MAH-g-PP were used. In the same manner, a polypropylene resin composition (C3) was obtained. The obtained polypropylene resin composition (C3) was prepared in an injection molding machine, and the flexural modulus, impact strength, heat deflection temperature, and scratch self-renewal were evaluated. The results are shown in Table 2.

Table 1 Polypropylene-based composite compositions of Examples 1 to 7 and Comparative Examples 1 to 3

Table 2 Properties of the specimens obtained according to Examples 1 to 7 and Comparative Examples 1 to 3

As can be seen in Examples 1 to 7 it can be seen that the polypropylene-based resin composition according to the present invention has excellent scratch self-renewability while maintaining good mechanical properties, impact resistance and heat resistance. Good mechanical properties, impact resistance and heat resistance compared with Comparative Example 1 using only a simple polypropylene resin or Comparative Example 2 using a polypropylene resin composition composed of a conventional polypropylene resin, thermoplastic elastomer and inorganic particles It can be seen that it possesses excellent scratch self regeneration at the same time. In the case of Comparative Example 3 in which the microcapsules were excessively prescribed, scratch reproducibility was very excellent, but mechanical properties, impact resistance, and heat resistance were too weak to achieve the object of the present invention.

The present invention described above is not limited to the above-described embodiments, and various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be obvious to him.

Claims (10)

To 30 parts by weight of polypropylene resin, 2 to 30 parts by weight of a microcapsule having an average particle diameter of 0.01 to 100 μm, wherein the cyclic olefin is an internal material and the wall material is melamine-formalin resin or urea-formalin resin, a transition metal-carbene complex A polypropylene resin composition comprising 0.001 to 0.5 parts by weight of a catalyst and 0.01 to 10 parts by weight of a polyolefin compatibilizer. The method of claim 1,
The polypropylene resin is a polypropylene resin composition is a propylene homopolymer or a copolymer comprising propylene. The method of claim 1,
The cyclic olefins are norbornene, 5-vinyl-2-norbornene, 5-butyl-2-norbornene, 5-methyl-2-norbornene, 5-hexyl-2-norbornene, 5- A polypropylene resin composition which is one or more selected from dimethylmethoxy norbornene, dicyclopentadiene, cyclopentadiene and derivatives thereof. The method of claim 1,
The polyolefin-based compatibilizer is maleic acid graft polypropylene, maleic anhydride graft polypropylene, maleic acid graft polyethylene, maleic acid graft polyethylene, ethylene-vinylacetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer With polyethylene ionomers, ethylene-glycidyl acrylate copolymers, ethylene-glycidyl methacrylate copolymers, ethylene-methacrylate-glycidyl acrylate copolymers and ethylene-methacrylate-glycidyl methacrylate copolymers. Polypropylene resin composition is a material selected from the group consisting of one or more. The method of claim 1,
A polypropylene resin composition further comprising 5 to 100 parts by weight of thermoplastic elastomer, based on 100 parts by weight of the polypropylene resin. The method of claim 1,
A polypropylene resin composition further comprising 5 to 100 parts by weight of inorganic particles, based on 100 parts by weight of the polypropylene resin. 6. The method of claim 5,
The thermoplastic elastomer is a polypropylene resin composition is an olefin elastomer or a styrene elastomer. The method according to claim 6,
The inorganic particles are talc, calcium carbonate, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, titanium oxide, alumina, mica, asbestos, zeolite, white silicate, glass fiber And a material selected from the group consisting of whiskers and at least one polypropylene resin composition. A scratch self-regenerated molded article obtained by melting or extruding by injecting the polypropylene resin composition of any one of claims 1 to 8. The scratch self-reproducing automotive part obtained by melting or extruding the polypropylene-based resin composition of any one of claims 1 to 8.